Eur Respir J 2007, doi:10.1183/09031936.00067307
Use of a T-cell interferon-
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| Abstract |
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The diagnosis of pleural tuberculosis (plTB) by the analysis of pleural effusions (PE) with standard diagnostic tools is difficult.
In routine clinical practice we evaluated the performance of a commercially available M. tuberculosis (MTB)-specific ELISpot assay on peripheral blood mononuclear cells (PBMCs) and pleural effusion mononuclear cells (PEMCs) in patients with suspect plTB.
The T-SPOT.TB (TS.TB) test (Oxford Immunotec Ltd, Abingdon, UK) was performed on PBMCs and PEMCs in 20 patients with a clinical and radiological suspect of plTB and in 21 control subjects with a diagnosis of pleural effusion of non-tuberculous origin at 4 centers participating in the European tuberculosis network (TBNET).
Eighteen of 20 (90%) patients with plTB tested TS.TB-positive on PBMCs and 19/20 (95%) on PEMCs. Among controls, TS.TB was positive in 7/21 patients (33%) when performed on PBMCs (these patients were assumed to be latently infected with MTB) and 5/21 (23%) when performed on PEMCs. Performed on PEMCs, sensitivity and specificity of TS.TB for the diagnosis of active plTB were 95% and 76%, respectively.
Enumerating MTB-specific T-cells in PEMCs by ELISpot is feasible in routine clinical practice and may be useful for a rapid and accurate diagnosis of plTB.
Keywords: CFP-10, ESAT-6, pleurisy, TIGRA, tuberculosis
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